Duplex-pressure electric pump-governor.



W. v. TURNER. DUPLEX PRESSURE ELECTRIC PUMP GOVERNOR. APPLICATION FILEDAPR. 11, L911.

1,112,495. Patented 0013.6,1914.

INVENTOR UNITED STATES PATENT @FFICE.

WALTER V. TURNER, OF EDGEWOOD, PENNSYLVANIA, A$SIGNOR TO THE WESTING-HOUSE AIR BRAKE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION 01PENNSYLVANIA.

DUPLEX-PRESSURE ELECTRIC PUlViP-GQVERNOR.

Specification of Letters Eatent.

Patented @ct. 6, 1914..

Application filed April 11, 1911. Serial No. 620,471.

To all whom it may concern:

Be it known that I, VVALTER V. TURNER, a citizen of the United States,residing at Edgewood, in the county of Allegheny and State ofPennsylvania, have invented new and useful Improvements inlluplex-Pressure Electric Pump-Governors, of which the following is aspecification.

This invention relates to pump governors, to and more particularly tothe class of pump governors'provided with a valve mechanism 5 adaptedwhen the pump pressure rises to a predetermined maximum degree ofpressure to'cut the pump out .of operation and when the pump pressurefalls to a predetermined minimum degree of pressure to cut the pump intooperation.

In some classes of service, it is highly desirable to be able to governthe pump according to one maximum and minimum degree of pressure at onetime and according to another maximum and minimum degree of pressure atanother time, such as, for example, where the equipment is employed bothin passenger service, in which a high standard degree of pressure isused,

- and in freight service, where alower standard degree of pressure isusually employed.

The principal object of my invention is to provide a pump governorhaving means for controlling the pump at one time according to onemaximum and minimum degree of pump pressure and at another timeaccording to another maximum and minimum degree of pump pressure.

In the accompanying drawing, Figure 1 is a sectional view of an electricpump governor, showing" my improvement applied thereto and Fig. 2 adetail sectional view of the controlling cock.

My invention may be employed in connection with various types ofgovernors, but I have shown the same in the drawing as applied to anelectric pump governor of what is known as the J type, such as coveredin my prior Patent No. 879,699, dated February 18, 1908. This form ofgovernor, as

shown in the drawing, comprises, broadly stated, a casing 1, a piston 2for controlling the pump motor switch 3, a valve 6 for supplying andreleasing fluid to and from the piston 2, a double piston device havingpiston heads l and 5 for operating the valve 6, and regulating valvedevices 7 and 8 governed by the pump pressure for supplying andreleasing fluid to and from the pistons a and 5 to thereby operate thevalve 6.

Fluid at pump pressure is supplied to the pump governor through pipe 9from the reservoir or other receptacle into which tlie pump compressesfluid, and in operation, upon the pump pressure rising to apredetermined maximum degree of pressure, as determined by the spring 10of the regulating valve device 7, the same operates to vent fluid frompiston head 4, thereby causing the valve 6 to be shifted to a positionfor supplying fluid to theswitch actuating piston 2. The piston 2 isthereupon operated to open the switch 3 and stop the pump.

When the pump pressure falls to a predetermined minimum degree ofpressure as determined by the adjustment of the spring 11, theregulating valve device 8 operates to vent fluid from the oppositepiston head 5 and the valve 6 is then shifted by the double pistondevice to a position in which fluid is vented from the piston 2-. Therelease of fluid from the piston 2 permits the spring 12 to shift saidpiston and thereby close the switch 3, thus starting the pump.

According to my improvement, in a branch pipe 13 of the pipe 9 isprovided an excess pressure valve device comprising a casing 1& having avalve chamber 15 containing a check valve 16, subject to the pressure ofan adjustable spring 17 and adapted to permit flow of air only from thepump reservoir to the governor.

A cook 18 is located in the main branch of the pipe 9, and in oneposition of the cock, as shown in Fig. 1, fluid may flow directly fromthe pump reservoir through the port 19 to the pump governor. In theposition-of the cook 18, as shown in Fig. 2, di-

rect communication is cut oil and fluid must operates in the usualmanner according to the maximum and minimum degree of vpressures inexcess of the pressures for pump pressure. If a higher range of maximumand minimum'pressures is desired, the cock is turned to the positionshown in Fig.

2, and the spring 17 being adjusted according to the higher degree ofpressure required, fluid is only admitted to the gov- "ernor at apressure a predetermined degree less than the'fu'll pump pressure, sothat When the pressure acting on the regulating valve device 7 hasincreased to the cutting out point, it will be evident that the pressurein the pump reservoir willbe a predetermined degree higher and likewisewhen the pressure on the regulating valve device 8 has become reduced tothe operating degree for same, the pump pressure will be higher by thepressure due-to the spring 17. For example, suppose the pump governorhas the maximum pressure regulating valve device 7 adjusted. to operateat 100. pounds and the minimum pressure regulating valve device 8adjusted to operate at 85 pounds, and suppose that it is also desired topros vide higher maximum and minimum pump -pressures of 140 and 125pounds respectively, then the spring 17 isadjusted at 40 pounds, so thatthe pump will cutout, when the excess pressure valve is cut in, at apump pressure of 100 pounds plus 40 pounds or 14:0 pounds and the pumpwill cut in at a pump pressure of 85 pounds plus 40 pounds or 125pounds.

A restricted exhaust passage 20 opens into the spring chamber 15, so asto prevent the bottling up of pressure in the pipe 9, and thepressure insaid pipe may then be con stantly maintained at apredetermined degreeless than the pump pressure according to the adjustment of the spring17, since loss of pressure in the pipe 9 by leakage through passage 20is'compensated for by s the opening of the valve 16, when the pres- 45sure in saidv pipe falls below the diflerential employed. 1

Having now described my invention, what I claim as new and: desire tosecure by Letters Patent, is:

1. The combination with a pump governor operating at'a' predeterminedmaximum degree. of pump pressure for cutting out the pump and at apredetermined minimum degree of pump pressure for cutting in the pump,of means for causing the pump governor to cut the pump into and out ofaction when the maximum and minimum pump pressures are higher than thosefor which the governor is adjusted.

'2. The combination with a pump governor normally operated according tothe .degree of pump pressure for cutting the pump into and out ofaction, of a valve device for supplying fluid to'the pump gov- 6 ernorat a pressure less than the pump presmined degree of pressure less thanthe pump sure, to thereby cause the governor to cut the'pump into andout of action at pump which-the governor is adjusted.

The combination with a pump governor comprising a movable abutment and aregulating valve mechanism normally operated according to the degree ofpump pressure for controlling the admission and release of fluid to andfrom said abutment to cause the pump to be cut into and; out of action,of an excess pressure valve for supplying fluid to operate the pumpgovernor to cut the pump into and out of action at pressures apredetermined degree less than the pump pressure.

' 4. The combination with a pump governor governed by fluid pressure andadapted at a predetermined maximum degree of pressure to cut the pumpout of action and at a predetermined minimum degree of pressure to cutthe pump into action,- of a valve device for supplying operating fluidto the pump governor at a predeterpressure and a cock havmg one positionin which communication is opened for supplying fluid at pump pressure tothe pump governor and another position for closing said communication,so that operating fluid is supplied to the pump governor through saidvalve device.

5. The combination with a pump governor comprising a movable abutmentand a valve mechanism operated by variations in fluid pressure forsupplying and releasing fluid to and from said abutment to control thepump, of an excess pressure valve sub ject to the opposing pressures ofan adjustable spring and the pump pressure for also supplying operatingfluid to the pump governor at a pressure a predetermined degree lessthan the pump pressure to thereby cause the pump to be cut in and out atpressures higher than normal.

6. The combination with a pump governor comprising a movable abutmentand a valve mechanism operated by variations in fluid pressure forsupplying and releasing fluid to and from said abutment to control thepump, of an excess pressure valve device for supply operating fluid tothe pump governor at a pressure a predetermined de gree less than thepump pressure, said valve device being provided with a restricted ex-12o haus't port for preventing the pressure of. fluid supplied to thepump governor from exceeding said predetermined degree of pressure. V

7 L The combination with a pump gov 126 ernor comprising a movableabutment and a valve mechanism operated by variations in fluid pressurefor supplying and releasing fluid to and from said abutment to controlthe pump, of an excess pressure valve device for supplying operatingfluid to the In testimony whereof I have hereunto set pump governor atit pressure a predetermy hand. mined degree less t an the pump pressureand means for preventing the pressure of WALTER TURNER fluid supplied tothe governor from ex Witnesses:

seeding the pressure as determined by said A. M. GLEMENTS,

valve device. W. KEEFER.

